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Hermann Ebbinghaus Forgetting Curve

Hermann Ebbinghaus extrapolated the hypothesis of the exponential nature of forgetting. The following formula can roughly describe it: R=e^{-\frac{t}{S}} where R is memory retention, S is the relative strength of memory, and t is time.

Hermann Ebbinghaus ran a limited, incomplete study on himself and published his hypothesis in 1885 as Über das Gedächtnis (later translated into English as Memory: A Contribution to Experimental Psychology). Ebbinghaus studied the memorisation of nonsense syllables, such as "WID" and "ZOF" by repeatedly testing himself after various time periods and recording the results.